Advances in surface acoustic wave technology, systems and by Clemens C. W. Ruppel

By Clemens C. W. Ruppel

A part of a suite of 14 studies of quite a lot of subject matters in acoustic wave know-how, geared toward the medical viewers. positive aspects seven really good papers in all, discussing problems with observed units, from Green's features to instant observed sensor structures.

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Extra resources for Advances in surface acoustic wave technology, systems and applications. Vol. 2

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62) equals A 2 , the square of the COM wavenumber for the shorted eigenmodes. For a symmetric structure, K and a are both real and, depending on the sign of K, the amplitudes interfere constructively on one edge of the stopband (usually, at the edge with lower frequency) giving a rise to resonance, and destructively on the other edge. 4. {x) +A+ R+ix) S+(x) + RE(X) SE(X) V. (63) Here V is the drive voltage, the subscripts (—) and (+) indicate the two shortedgrating eigenmodes, reducing to the counter-propagating waves in the limit of vanishing reflectivity, and the subscript E denotes the field excited.

The second and third terms describe the linear shift due to the mechanical loading and the so-called energy storage effect, 44 ' 48 respectively. The energy storage effect is present also in periodic arrays of grooves, where the mass loading is absent and the first order effect is negligible. For aluminum electrodes in quartz, LiNbC>3 and LiTaC>3 both terms are usually negative. Table 2 gives some idea of the values, extracted 4 9 from rigorous simulations. When the velocity of the surface wave is much higher than that of bulk shear wave in the (thin) aluminum electrodes, the linear term in the expansion dominates, and the SAW velocity decreases almost linearly with increasing electrode thickness.

Plessky & J. Koskela gratings. Consequently, the harmonic admittance may be interpreted as the ratio of the dispersion relations for open and shorted gratings: YM) (n6) 'WTY This relation has nonobvious generality and it serves as the connection between the propagation and excitation problems. Rigorous mathematical proof of the theorem was recently found by Biryukov. , from numerical computations with the boundary-element method. sc = 0 respectively define the dispersion relations for open and shorted electrode arrays.

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